PHILADELPHIA — A trial witness who worked at a Philadelphia abortion clinic at age 15 says she saw at least one baby’s chest move after the procedure.

Ashley Baldwin testified Thursday at the capital murder trial of abortion provider Kermit Gosnell. The 72-year-old doctor is charged with killing seven newborns and a female patient who died after an abortion.

Baldwin said she learned to do intravenous injections as a high school student and assisted with abortions.

Her mother, Tina, also worked at the chaotic street-corner clinic in West Philadelphia. She has pleaded guilty to corruption of a minor for letting her daughter work at what prosecutors call a corrupt organization.

Ashley Baldwin, who is now in her early 20s and the mother of a toddler, said she saw a baby described at trial as “Baby A” in a hallway.

“The chest was moving,” she testified Thursday.

The baby was so large that worker Adrienne Moton took a cellphone picture of it. Prosecution experts, based on the picture, say the baby was well past 24 weeks, the legal limit for abortion in Pennsylvania.

The baby’s mother, then a teenager, has also testified about the difficult, three-day abortion process.

In addition to the murder charge, Gosnell is also charged with performing illegal, late-term abortions and other charges. Seven other employees have also pleaded guilty, some to third-degree murder. Another, Eileen O’Neill of Phoenixville, is on trial with Gosnell.

Gosnell’s lawyer insists that no babies were born alive. Gosnell allegedly told his staff that any movement seen was an involuntary response during the death process.

The lawyer, Jack McMahon, is set to cross-examine Baldwin on Thursday afternoon.

Prosecutors say they have physical evidence, based on autopsies, that two babies took a breath, and eyewitness accounts that five others were born alive and then killed with scissors.

An unlicensed medical school graduate, Stephen Massof, and others have testified that Gosnell trained him to “snip” the babies in the back of the neck to ensure “fetal demise.”

Tina Baldwin’s husband, Michael Baldwin, told the AP after the 2011 indictment that his wife was referred to Gosnell’s clinic through a business school internship, and worked for eight years at the front desk.

Other clinic workers have said they sought employment from Gosnell — who was a doctor to some of them — after losing jobs elsewhere. In opening statements last month, prosecutors said some of them were as desperate as the women seeking late-term abortions.

Prosecutors say he made millions over the years through the cash-only abortions, and by distributing painkillers to addicts and drug dealers from another portion of the clinic. Gosnell is also facing a federal trial on the drug charges.